Bimetallic MOF-BasedEnzyme-Free Sensor for Highly Sensitive and Selective Detection of Dopamine

A bimetallic metal organic frameworks termed as Fe2Ni MIL-88B was fabricated as an enzyme-free dopamine (DA) sensor, which was designed with crystalline porous structure and synthesized by a facile hydrothermal technique. To gain insight into the structure and morphology of Fe2Ni MIL-88B, a series of characterizations such as fourier transform infrared (FTIR), X-ray diffraction (XRD), transmission electron microscopic (TEM) and field emission scanning electron microscopic (FE-SEM) had been performed, proving the as-prepared composite owned hexagonal rod-like structure with the size 633 nm-967 nm in length and 100 nm-167 nm in width. The Fe2Ni MIL-88B modified glass carbon electrode (Fe2Ni MIL-88B/GCE) possessed an excellent electrochemical catalytic performance to DA which are derived from electrochemical test, having been reported to own wider linear range from 1.2 mu M-1.8 mM, lower detection limit of 0.40 mu M (S/N= 3) and higher sensitivity of 124.7 mu AmM-1 cm(-2). The proposed sensor exhibited acceptable stability, repeatability and achievability for analyzing real samples. All the evidence suggested a potential application of Fe2Ni MIL-88B in DA detection. (C) 2019 The Electrochemical Society.